Motor racing-Barrichello joins Button at back of Turkish grid

ISTANBUL, Aug 26 (Reuters) Brazilian Rubens Barrichello joined team mate Jenson Button at the back of the Turkish Grand Prix starting grid today after Honda also changed the engine of his car.

Under Formula One rules, engines must last two successive races unless a driver fails to finish. Any unscheduled change after the end of Friday free practice incurs a 10 place penalty on the starting grid.

Honda said yesterday Button would have his engine switched out after a problem in qualifying. The Briton, scorer of Honda's only point in 11 races this season, had qualified 15th with Barrichello 14th.

REUTERS BJR PM1555